Phi² Pavonis
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(Redirected from Phi2 Pavonis)
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Pavo |
| Right ascension | 20h 40m 02.64s |
| Declination | -60° 32′ 40″ |
| Apparent magnitude (V) | +5.12 |
| Characteristics | |
| Spectral type | F8V |
| Variable type | None |
| Astrometry | |
| Distance | 81.6 ly (25 pc) |
| Details | |
| Radius | 1.87 R☉ |
| Temperature | 6200 K |
| Metallicity | −0.44 Fe/H [1] |
| Rotation | 7 days? |
| Age | 5 Gyr years |
| Other designations | |
|
HD 196378, HIP 101983, HR 7875, Gl 794.2, GJ 9701
|
|
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Phi² Pavonis (φ² Pav, φ² Pavonis), also known as HD 196378, is a yellow-white dwarf star approximately 82 light-years away in the constellation of Pavo (the Peacock). It is evolving into a subgiant.
This system was in 1991 a test case for the Zeta Herculis moving group, of low metallicity stars with 5 billion years of age. This group includes besides Zeta Herculis: δ Trianguli, ζ Reticuli, 1 Hydrae, Gl 456, Gl 678, and Gl 9079.[2]
In 1998, using the European Southern Telescope in Chile, a planet was announced to be orbiting the star.[3] This team retracted this claim in 2002, but found a different periodicity of 7 days possibly due to stellar rotation.[4]
[edit] See also
[edit] References
- ^ Edvardsson, B., Andersen, J., Gustafsson, B., et al. (1993). "The chemical evolution of the galactic disk I. Analysis and results". A&A (275): 101.
- ^ G. F. Porto de Mello, L. da Silva (1991). "On the physical existence of the Zeta HER moving group - A detailed analysis of Phi exp 2 Pavonis". Astronomical Journal 102: 1816–1825. Bibcode 1991AJ....102.1816P. doi:10.1086/116006.
- ^ M. Kürster (1998). "The ESO radial velocity planet search program". Workshop: Science with Gemini. http://citeseerx.ist.psu.edu/viewdoc/download;jsessionid=42666AC365051E901C1259A0E340E723?doi=10.1.1.53.4018&rep=rep1&type=pdf.
- ^ M. Endl, M. Kürster et al. (2002). "The planet search program at the ESO Coudé Echelle spectrometer III. The complete Long Camera survey results". Astronomy & Astrophysics 392 (2): 671–690. arXiv:astro-ph/0207512. Bibcode 2002A&A...392..671E. doi:10.1051/0004-6361:20020937. http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/ref/2002/35/aa2400/aa2400.html.
[edit] External links
- Phi2 Pavonis at Extrasolar Visions (listed as "controversial" here and not updated before 2005)
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